Because it only apply on the real nails .It is thin , more shine and looks like regular nails polish.It is not only looks natural it is no damage the base nails . It is last longer and extended two weeks warranty .So no need filing require ,no sanding the nail base , no chemical or artificial need , no free waiting time .After dried : Done - no worry - no need to care about the gel will chip off.Can do every activities with hand and feet, no peeling or chipping . It is flexible and easy for every one.